Using a pointer

Using a pointer 

Following example shows how a pointer can be used to access the value in a variable. 

int n=20,x; n x 20 garbage 

1002 2000 

int *ptr_n; /*uninitialized pointer*/ ptr_n garbage 

1006 

ptr_n=&n; /* store address of n in ptr_n */ ptr_n 

1002 

1006 

*ptr _n = 30; /*modify value */ n 

30

1002 

Here we have accessed the contents of variable n using the pointer ptr_n. This can be done using the *operator. 

*(ptr_n) => value at(ptr_n) => value at 1002 => 30  

Also Read

1. Static and Dynamic Memory Allocation
2. Memory Leak and Dangling Pointer
3. Memory Allocation for 2D Array
4. Dynamic Memory Allocation
5. Pointer Constant and Constant Pointer
6. Pointer Declarations and their Meanings
7. Functions and Pointers
8. Initializing Pointer to Pointer
9. Pointer to Pointer Multiple Indirection
10. Relationship between Array and Pointer
11. Pointer to Array
12. Pointer Arithmetic
13. Types of Pointer
14. Illustrate Basic Pointer Use
15. Intializing Pointer
16. Declaring Pointer
17. Application of Pointers
18. Value Model VS Reference Model
19. What is Pointer